Photos: No pants event takes a ride on BART in the Bay Area

Folks riding BART through the San Francisco Bay Area participated in the "12th Annual No Pants Subway Ride" on Sunday Jan. 13, 2013. The event organized by Improv Everywhere, involves participants to strip down to their underwear as they go about their normal routine while keeping a straight face. BART riders joined those in New York, Germany, and Mexico who all participated in the event.